3.5Mm earphone jack (finally!)
Best resolution screen out there 800 x 480
3.15 Mega pixel camera
Experia touch panels (customisable)
Thick (not in the dumb sense)
Lag fom programs
Not a cybershot camera (that means no flashy flash or lens)
Small amount of built in memory 400mb but u can buy more (micro sd)
Just a few general points i've picked up from reading various reviews, hope this helps.
I'm getting one despite the flaws cause it still one of the best phones on the market.